No, the developers are no longer working on the game and they have no intention of going back to it. The only way it will come to Linux is if they hire someone to do it or if a fan manages to make their own port and then asks Team Meat to release it. The main reason there isn't a port to Linux is because the developers did the math for it and it wouldn't be profitable to make a Linux port.

There is a Linux port from Humble Bundle, but Team Meat didn't make it, and as far as I know they have no intention of having it uploaded to Steam. It has been asked a million times on Edmund's Formspring (or whatever it's now called) and at the moment it seems Super Meat Boy won't be available on Linux here on Steam.

No, the developers are no longer working on the game and they have no intention of going back to it. The only way it will come to Linux is if they hire someone to do it or if a fan manages to make their own port and then asks Team Meat to release it. The main reason there isn't a port to Linux is because the developers did the math for it and it wouldn't be profitable to make a Linux port.